to_ipc_ns
return current_in_namespace(to_ipc_ns(ns));
if (!current_in_namespace(to_ipc_ns(ns)))
owning_ns = to_ipc_ns(ns)->user_ns;
return put_ipc_ns(to_ipc_ns(ns));
struct ipc_namespace *ns = to_ipc_ns(new);
return to_ipc_ns(ns)->user_ns;